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Insurance Reserves and Policyholder Funds, Liability for Unpaid Losses, Claims and Loss Adjustment Expenses (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Claim
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Liabilities for losses, claims and loss adjustment expenses, net of reinsurance $ 56,565                  
Duration required for loss data to develop the estimated ultimate incurred claims 36 months                  
Minimum [Member]                    
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Property and casualty claim threshold amount required for review $ 25,000                  
Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 534,979                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance 522,266                  
Liabilities for losses, claims and loss adjustment expenses, net of reinsurance 12,713                  
Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 178,100                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance 144,156                  
Liabilities for losses, claims and loss adjustment expenses, net of reinsurance 33,944                  
Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 35,547                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance 34,063                  
All outstanding liabilities prior period net of reinsurance 0                  
Liabilities for losses, claims and loss adjustment expenses, net of reinsurance 1,484                  
General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 12,230                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance 9,538                  
All outstanding liabilities prior period net of reinsurance 402                  
Liabilities for losses, claims and loss adjustment expenses, net of reinsurance 3,094                  
Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 34,040                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance 30,831                  
All outstanding liabilities prior period net of reinsurance 3                  
Liabilities for losses, claims and loss adjustment expenses, net of reinsurance 3,212                  
Accident Year 2009 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 30,430 $ 30,430 $ 30,430 $ 30,431 $ 30,432 $ 30,438 $ 30,447 $ 30,481 $ 30,455 $ 31,124
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 560,430                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 30,430 30,430 30,430 30,431 30,432 30,438 30,447 30,481 30,455 29,866
Accident Year 2009 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 8,153 8,153 8,154 8,155 8,123 8,245 8,558 8,659 8,891 10,817
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,755                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 8,153 8,153 8,154 8,155 8,123 7,995 7,502 6,353 5,208 3,250
Accident Year 2009 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 1,921 1,888 1,832 1,828 1,727 1,702 1,730 1,944 2,215 3,392
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 290                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 1,921 1,855 1,816 1,796 1,662 1,629 1,410 1,082 941 476
Accident Year 2009 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 4,590 4,667 4,664 4,916 4,636 3,616 3,951 4,239 5,025 4,920
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 84                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 4,590 4,666 4,663 3,757 3,760 3,410 3,205 2,640 1,595 $ 103
Accident Year 2010 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 34,264 34,265 34,268 34,272 34,282 34,303 34,323 34,328 34,849  
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 625,698                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 34,264 34,265 34,268 34,272 34,282 34,303 34,323 34,328 29,127  
Accident Year 2010 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 10,209 10,201 10,202 10,185 10,068 9,937 10,547 10,818 10,752  
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,947                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 10,210 10,206 10,090 10,056 9,725 9,382 8,291 6,274 3,211  
Accident Year 2010 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 2,480 2,473 2,423 2,400 2,258 2,337 2,269 2,699 4,114  
IBNR Reserves $ 4                  
Cumulative number of reported claims | Claim 289                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 2,463 2,457 2,382 2,368 2,037 1,542 1,374 678 284  
Accident Year 2010 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 3,530 3,534 3,563 3,549 3,607 3,396 3,618 4,624 3,995  
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 95                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 3,530 3,534 3,560 3,545 3,252 2,943 2,780 2,193 $ 928  
Accident Year 2011 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 38,297 38,299 38,302 38,316 38,327 38,360 38,296 38,188    
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 664,056                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 38,297 38,299 38,302 38,316 38,327 38,360 38,296 31,720    
Accident Year 2011 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 13,330 13,385 13,495 13,281 13,289 13,235 13,802 12,263    
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 2,132                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 13,330 13,199 13,106 13,039 12,071 9,858 7,934 4,205    
Accident Year 2011 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 1,335 1,327 1,242 1,174 1,338 1,452 1,723 3,022    
IBNR Reserves $ 12                  
Cumulative number of reported claims | Claim 204                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 1,285 1,278 1,169 1,161 835 582 412 295    
Accident Year 2011 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 5,111 5,112 5,031 4,966 5,092 5,080 4,786 4,422    
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 126                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 5,111 5,109 5,022 4,939 4,748 4,622 3,207 $ 1,031    
Accident Year 2012 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 50,985 50,987 50,989 50,998 51,021 50,996 50,021      
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 867,050                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 50,985 50,987 50,989 50,998 51,021 50,996 42,267      
Accident Year 2012 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 13,357 13,343 13,313 13,707 14,108 15,007 12,980      
IBNR Reserves $ 12                  
Cumulative number of reported claims | Claim 2,343                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 13,288 13,211 13,197 12,932 11,507 8,791 4,627      
Accident Year 2012 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 1,344 1,333 1,214 1,270 1,269 1,305 4,055      
IBNR Reserves $ 19                  
Cumulative number of reported claims | Claim 158                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 1,260 1,219 1,113 1,034 847 707 371      
Accident Year 2012 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 4,892 4,880 4,869 5,345 5,396 4,767 4,979      
IBNR Reserves $ 2                  
Cumulative number of reported claims | Claim 89                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 4,878 4,880 4,869 5,331 4,856 4,581 $ 2,257      
Accident Year 2013 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 57,016 57,021 57,023 57,034 56,970 56,974        
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 957,362                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 57,016 57,021 57,023 57,034 56,970 47,770        
Accident Year 2013 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 21,020 21,352 21,823 21,096 20,702 18,664        
IBNR Reserves $ 7                  
Cumulative number of reported claims | Claim 3,265                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 20,982 20,382 19,407 16,782 12,193 5,144        
Accident Year 2013 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 820 865 817 926 728 3,461        
IBNR Reserves $ 4                  
Cumulative number of reported claims | Claim 187                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 803 791 811 579 339 104        
Accident Year 2013 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 2,809 2,866 2,947 2,743 2,007 3,060        
IBNR Reserves $ 10                  
Cumulative number of reported claims | Claim 58                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 2,749 2,789 2,763 1,369 1,010 $ 323        
Accident Year 2014 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 56,976 56,981 56,981 56,938 57,179          
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 939,472                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 56,976 56,981 56,981 56,938 48,024          
Accident Year 2014 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 21,682 22,353 22,041 21,881 20,812          
IBNR Reserves $ 134                  
Cumulative number of reported claims | Claim 3,541                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 20,878 20,177 17,554 13,807 6,822          
Accident Year 2014 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 7,561 7,562 7,583 7,657 8,079          
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,635                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 7,561 7,562 7,570 7,619 6,437          
Accident Year 2014 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 406 476 557 501 3,744          
IBNR Reserves $ 8                  
Cumulative number of reported claims | Claim 192                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 373 369 331 299 171          
Accident Year 2014 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 2,685 2,760 2,990 3,130 3,214          
IBNR Reserves $ 4                  
Cumulative number of reported claims | Claim 53                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 2,664 2,739 2,727 2,327 $ 1,331          
Accident Year 2015 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 54,990 54,993 54,939 55,482            
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 898,370                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 54,990 54,993 54,876 45,430            
Accident Year 2015 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 20,007 20,017 19,857 18,521            
IBNR Reserves $ 898                  
Cumulative number of reported claims | Claim 3,521                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 17,612 14,938 11,878 6,226            
Accident Year 2015 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 7,896 7,887 7,955 8,287            
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,588                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 7,895 7,885 7,937 6,745            
Accident Year 2015 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 1,044 1,227 1,037 4,421            
IBNR Reserves $ 143                  
Cumulative number of reported claims | Claim 144                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 664 464 259 98            
Accident Year 2015 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 1,359 1,400 1,630 1,902            
IBNR Reserves $ 39                  
Cumulative number of reported claims | Claim 49                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 1,125 1,127 856 $ 641            
Accident Year 2016 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 63,226 59,851 58,849              
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,036,748                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 63,226 59,747 49,165              
Accident Year 2016 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 21,846 21,275 20,549              
IBNR Reserves $ 2,043                  
Cumulative number of reported claims | Claim 3,822                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 16,397 13,141 6,796              
Accident Year 2016 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 6,352 6,386 6,877              
IBNR Reserves $ 1                  
Cumulative number of reported claims | Claim 1,267                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 6,349 6,353 5,804              
Accident Year 2016 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 736 1,148 3,119              
IBNR Reserves $ 80                  
Cumulative number of reported claims | Claim 84                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 568 203 116              
Accident Year 2016 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 1,865 1,812 3,314              
IBNR Reserves $ 27                  
Cumulative number of reported claims | Claim 46                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 1,772 1,732 $ 1,054              
Accident Year 2017 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 69,655 67,960                
IBNR Reserves $ 130                  
Cumulative number of reported claims | Claim 1,510,485                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 69,517 57,696                
Accident Year 2017 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 24,212 22,179                
IBNR Reserves $ 2,961                  
Cumulative number of reported claims | Claim 3,719                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 16,317 7,401                
Accident Year 2017 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 5,933 6,257                
IBNR Reserves $ 2                  
Cumulative number of reported claims | Claim 1,316                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 5,914 5,215                
Accident Year 2017 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 488 1,490                
IBNR Reserves $ 184                  
Cumulative number of reported claims | Claim 72                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 136 75                
Accident Year 2017 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 3,671 4,677                
IBNR Reserves $ 203                  
Cumulative number of reported claims | Claim 57                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 3,255 $ 1,971                
Accident Year 2018 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 79,140                  
IBNR Reserves $ 11,584                  
Cumulative number of reported claims | Claim 1,781,051                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 66,565                  
Accident Year 2018 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 24,284                  
IBNR Reserves $ 7,466                  
Cumulative number of reported claims | Claim 3,205                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 6,989                  
Accident Year 2018 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 7,805                  
IBNR Reserves $ 145                  
Cumulative number of reported claims | Claim 1,343                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 6,344                  
Accident Year 2018 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 1,656                  
IBNR Reserves $ 1,519                  
Cumulative number of reported claims | Claim 42                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 65                  
Accident Year 2018 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance 3,528                  
IBNR Reserves $ 1,872                  
Cumulative number of reported claims | Claim 59                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance $ 1,157